Question: When did Ernst Wilimowski become the member of a sports team known as FC Signen 04?
Paraphrase: At what time did Ernst Wilimowski become the member of a sports team known as FC Signen 04?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q559779 p:P54 ?s . ?s ps:P54 wd:Q319868 . ?s pq:P580 ?value}